/*
 * Silicon Motion SM7XX frame buffer device
 *
 * Copyright (C) 2006 Silicon Motion Technology Corp.
 * Authors: Ge Wang, gewang@siliconmotion.com
 *	    Boyod boyod.yang@siliconmotion.com.cn
 *
 * Copyright (C) 2009 Lemote, Inc.
 * Author: Wu Zhangjin, wuzhangjin@gmail.com
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License. See the file COPYING in the main directory of this archive for
 *  more details.
 *
 * Version 0.10.26192.21.01
 *	- Add PowerPC/Big endian support
 *	- Add 2D support for Lynx
 *	- Verified on2.6.19.2  Boyod.yang <boyod.yang@siliconmotion.com.cn>
 *
 * Version 0.09.2621.00.01
 *	- Only support Linux Kernel's version 2.6.21.
 *	Boyod.yang  <boyod.yang@siliconmotion.com.cn>
 *
 * Version 0.09
 *	- Only support Linux Kernel's version 2.6.12.
 *	Boyod.yang <boyod.yang@siliconmotion.com.cn>
 */

#ifndef __KERNEL__
#define __KERNEL__
#endif

#include <linux/io.h>
#include <linux/fb.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/console.h>
#include <linux/screen_info.h>

#ifdef CONFIG_PM
#include <linux/pm.h>
#endif

struct screen_info smtc_screen_info;

#include "smtcfb.h"

#ifdef DEBUG
#define smdbg(format, arg...)	printk(KERN_DEBUG format , ## arg)
#else
#define smdbg(format, arg...)
#endif

/*
* Private structure
*/
struct smtcfb_info {
	/*
	 * The following is a pointer to be passed into the
	 * functions below.  The modules outside the main
	 * voyager.c driver have no knowledge as to what
	 * is within this structure.
	 */
	struct fb_info fb;
	struct display_switch *dispsw;
	struct pci_dev *dev;
	signed int currcon;

	struct {
		u8 red, green, blue;
	} palette[NR_RGB];

	u_int palette_size;
};

struct par_info {
	/*
	 * Hardware
	 */
	u16 chipID;
	unsigned char __iomem *m_pMMIO;
	char __iomem *m_pLFB;
	char *m_pDPR;
	char *m_pVPR;
	char *m_pCPR;

	u_int width;
	u_int height;
	u_int hz;
	u_long BaseAddressInVRAM;
	u8 chipRevID;
};

struct vesa_mode_table	{
	char mode_index[6];
	u16 lfb_width;
	u16 lfb_height;
	u16 lfb_depth;
};

static struct vesa_mode_table vesa_mode[] = {
	{"0x301", 640,  480,  8},
	{"0x303", 800,  600,  8},
	{"0x305", 1024, 768,	8},
	{"0x307", 1280, 1024, 8},

	{"0x311", 640,  480,  16},
	{"0x314", 800,  600,  16},
	{"0x317", 1024, 768,	16},
	{"0x31A", 1280, 1024, 16},

	{"0x312", 640,  480,  24},
	{"0x315", 800,  600,  24},
	{"0x318", 1024, 768,	24},
	{"0x31B", 1280, 1024, 24},
};

char __iomem *smtc_RegBaseAddress;	/* Memory Map IO starting address */
char __iomem *smtc_VRAMBaseAddress;	/* video memory starting address */

static u32 colreg[17];
static struct par_info hw;	/* hardware information */

u16 smtc_ChipIDs[] = {
	0x710,
	0x712,
	0x720
};

#define numSMTCchipIDs (sizeof(smtc_ChipIDs) / sizeof(u16))

static void sm712_set_timing(struct smtcfb_info *sfb,
			     struct par_info *ppar_info)
{
	int i = 0, j = 0;
	u32 m_nScreenStride;

	smdbg("\nppar_info->width = %d ppar_info->height = %d"
			"sfb->fb.var.bits_per_pixel = %d ppar_info->hz = %d\n",
			ppar_info->width, ppar_info->height,
			sfb->fb.var.bits_per_pixel, ppar_info->hz);

	for (j = 0; j < numVGAModes; j++) {
		if (VGAMode[j].mmSizeX == ppar_info->width &&
		    VGAMode[j].mmSizeY == ppar_info->height &&
		    VGAMode[j].bpp == sfb->fb.var.bits_per_pixel &&
		    VGAMode[j].hz == ppar_info->hz) {

			smdbg("\nVGAMode[j].mmSizeX  = %d VGAMode[j].mmSizeY ="
					"%d VGAMode[j].bpp = %d"
					"VGAMode[j].hz=%d\n",
					VGAMode[j].mmSizeX, VGAMode[j].mmSizeY,
					VGAMode[j].bpp, VGAMode[j].hz);

			smdbg("VGAMode index=%d\n", j);

			smtc_mmiowb(0x0, 0x3c6);

			smtc_seqw(0, 0x1);

			smtc_mmiowb(VGAMode[j].Init_MISC, 0x3c2);

			/* init SEQ register SR00 - SR04 */
			for (i = 0; i < SIZE_SR00_SR04; i++)
				smtc_seqw(i, VGAMode[j].Init_SR00_SR04[i]);

			/* init SEQ register SR10 - SR24 */
			for (i = 0; i < SIZE_SR10_SR24; i++)
				smtc_seqw(i + 0x10,
					  VGAMode[j].Init_SR10_SR24[i]);

			/* init SEQ register SR30 - SR75 */
			for (i = 0; i < SIZE_SR30_SR75; i++)
				if (((i + 0x30) != 0x62) \
					&& ((i + 0x30) != 0x6a) \
					&& ((i + 0x30) != 0x6b))
					smtc_seqw(i + 0x30,
						VGAMode[j].Init_SR30_SR75[i]);

			/* init SEQ register SR80 - SR93 */
			for (i = 0; i < SIZE_SR80_SR93; i++)
				smtc_seqw(i + 0x80,
					  VGAMode[j].Init_SR80_SR93[i]);

			/* init SEQ register SRA0 - SRAF */
			for (i = 0; i < SIZE_SRA0_SRAF; i++)
				smtc_seqw(i + 0xa0,
					  VGAMode[j].Init_SRA0_SRAF[i]);

			/* init Graphic register GR00 - GR08 */
			for (i = 0; i < SIZE_GR00_GR08; i++)
				smtc_grphw(i, VGAMode[j].Init_GR00_GR08[i]);

			/* init Attribute register AR00 - AR14 */
			for (i = 0; i < SIZE_AR00_AR14; i++)
				smtc_attrw(i, VGAMode[j].Init_AR00_AR14[i]);

			/* init CRTC register CR00 - CR18 */
			for (i = 0; i < SIZE_CR00_CR18; i++)
				smtc_crtcw(i, VGAMode[j].Init_CR00_CR18[i]);

			/* init CRTC register CR30 - CR4D */
			for (i = 0; i < SIZE_CR30_CR4D; i++)
				smtc_crtcw(i + 0x30,
					   VGAMode[j].Init_CR30_CR4D[i]);

			/* init CRTC register CR90 - CRA7 */
			for (i = 0; i < SIZE_CR90_CRA7; i++)
				smtc_crtcw(i + 0x90,
					   VGAMode[j].Init_CR90_CRA7[i]);
		}
	}
	smtc_mmiowb(0x67, 0x3c2);

	/* set VPR registers */
	writel(0x0, ppar_info->m_pVPR + 0x0C);
	writel(0x0, ppar_info->m_pVPR + 0x40);

	/* set data width */
	m_nScreenStride =
		(ppar_info->width * sfb->fb.var.bits_per_pixel) / 64;
	switch (sfb->fb.var.bits_per_pixel) {
	case 8:
		writel(0x0, ppar_info->m_pVPR + 0x0);
		break;
	case 16:
		writel(0x00020000, ppar_info->m_pVPR + 0x0);
		break;
	case 24:
		writel(0x00040000, ppar_info->m_pVPR + 0x0);
		break;
	case 32:
		writel(0x00030000, ppar_info->m_pVPR + 0x0);
		break;
	}
	writel((u32) (((m_nScreenStride + 2) << 16) | m_nScreenStride),
	       ppar_info->m_pVPR + 0x10);

}

static void sm712_setpalette(int regno, unsigned red, unsigned green,
			     unsigned blue, struct fb_info *info)
{
	struct par_info *cur_par = (struct par_info *)info->par;

	if (cur_par->BaseAddressInVRAM)
		/*
		 * second display palette for dual head. Enable CRT RAM, 6-bit
		 * RAM
		 */
		smtc_seqw(0x66, (smtc_seqr(0x66) & 0xC3) | 0x20);
	else
		/* primary display palette. Enable LCD RAM only, 6-bit RAM */
		smtc_seqw(0x66, (smtc_seqr(0x66) & 0xC3) | 0x10);
	smtc_mmiowb(regno, dac_reg);
	smtc_mmiowb(red >> 10, dac_val);
	smtc_mmiowb(green >> 10, dac_val);
	smtc_mmiowb(blue >> 10, dac_val);
}

static void smtc_set_timing(struct smtcfb_info *sfb, struct par_info
		*ppar_info)
{
	switch (ppar_info->chipID) {
	case 0x710:
	case 0x712:
	case 0x720:
		sm712_set_timing(sfb, ppar_info);
		break;
	}
}

static struct fb_var_screeninfo smtcfb_var = {
	.xres = 1024,
	.yres = 600,
	.xres_virtual = 1024,
	.yres_virtual = 600,
	.bits_per_pixel = 16,
	.red = {16, 8, 0},
	.green = {8, 8, 0},
	.blue = {0, 8, 0},
	.activate = FB_ACTIVATE_NOW,
	.height = -1,
	.width = -1,
	.vmode = FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo smtcfb_fix = {
	.id = "sm712fb",
	.type = FB_TYPE_PACKED_PIXELS,
	.visual = FB_VISUAL_TRUECOLOR,
	.line_length = 800 * 3,
	.accel = FB_ACCEL_SMI_LYNX,
};

/* chan_to_field
 *
 * convert a colour value into a field position
 *
 * from pxafb.c
 */

static inline unsigned int chan_to_field(unsigned int chan,
					 struct fb_bitfield *bf)
{
	chan &= 0xffff;
	chan >>= 16 - bf->length;
	return chan << bf->offset;
}

static int cfb_blank(int blank_mode, struct fb_info *info)
{
	/* clear DPMS setting */
	switch (blank_mode) {
	case FB_BLANK_UNBLANK:
		/* Screen On: HSync: On, VSync : On */
		smtc_seqw(0x01, (smtc_seqr(0x01) & (~0x20)));
		smtc_seqw(0x6a, 0x16);
		smtc_seqw(0x6b, 0x02);
		smtc_seqw(0x21, (smtc_seqr(0x21) & 0x77));
		smtc_seqw(0x22, (smtc_seqr(0x22) & (~0x30)));
		smtc_seqw(0x23, (smtc_seqr(0x23) & (~0xc0)));
		smtc_seqw(0x24, (smtc_seqr(0x24) | 0x01));
		smtc_seqw(0x31, (smtc_seqr(0x31) | 0x03));
		break;
	case FB_BLANK_NORMAL:
		/* Screen Off: HSync: On, VSync : On   Soft blank */
		smtc_seqw(0x01, (smtc_seqr(0x01) & (~0x20)));
		smtc_seqw(0x6a, 0x16);
		smtc_seqw(0x6b, 0x02);
		smtc_seqw(0x22, (smtc_seqr(0x22) & (~0x30)));
		smtc_seqw(0x23, (smtc_seqr(0x23) & (~0xc0)));
		smtc_seqw(0x24, (smtc_seqr(0x24) | 0x01));
		smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
		break;
	case FB_BLANK_VSYNC_SUSPEND:
		/* Screen On: HSync: On, VSync : Off */
		smtc_seqw(0x01, (smtc_seqr(0x01) | 0x20));
		smtc_seqw(0x20, (smtc_seqr(0x20) & (~0xB0)));
		smtc_seqw(0x6a, 0x0c);
		smtc_seqw(0x6b, 0x02);
		smtc_seqw(0x21, (smtc_seqr(0x21) | 0x88));
		smtc_seqw(0x22, ((smtc_seqr(0x22) & (~0x30)) | 0x20));
		smtc_seqw(0x23, ((smtc_seqr(0x23) & (~0xc0)) | 0x20));
		smtc_seqw(0x24, (smtc_seqr(0x24) & (~0x01)));
		smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
		smtc_seqw(0x34, (smtc_seqr(0x34) | 0x80));
		break;
	case FB_BLANK_HSYNC_SUSPEND:
		/* Screen On: HSync: Off, VSync : On */
		smtc_seqw(0x01, (smtc_seqr(0x01) | 0x20));
		smtc_seqw(0x20, (smtc_seqr(0x20) & (~0xB0)));
		smtc_seqw(0x6a, 0x0c);
		smtc_seqw(0x6b, 0x02);
		smtc_seqw(0x21, (smtc_seqr(0x21) | 0x88));
		smtc_seqw(0x22, ((smtc_seqr(0x22) & (~0x30)) | 0x10));
		smtc_seqw(0x23, ((smtc_seqr(0x23) & (~0xc0)) | 0xD8));
		smtc_seqw(0x24, (smtc_seqr(0x24) & (~0x01)));
		smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
		smtc_seqw(0x34, (smtc_seqr(0x34) | 0x80));
		break;
	case FB_BLANK_POWERDOWN:
		/* Screen On: HSync: Off, VSync : Off */
		smtc_seqw(0x01, (smtc_seqr(0x01) | 0x20));
		smtc_seqw(0x20, (smtc_seqr(0x20) & (~0xB0)));
		smtc_seqw(0x6a, 0x0c);
		smtc_seqw(0x6b, 0x02);
		smtc_seqw(0x21, (smtc_seqr(0x21) | 0x88));
		smtc_seqw(0x22, ((smtc_seqr(0x22) & (~0x30)) | 0x30));
		smtc_seqw(0x23, ((smtc_seqr(0x23) & (~0xc0)) | 0xD8));
		smtc_seqw(0x24, (smtc_seqr(0x24) & (~0x01)));
		smtc_seqw(0x31, ((smtc_seqr(0x31) & (~0x07)) | 0x00));
		smtc_seqw(0x34, (smtc_seqr(0x34) | 0x80));
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int smtc_setcolreg(unsigned regno, unsigned red, unsigned green,
			  unsigned blue, unsigned trans, struct fb_info *info)
{
	struct smtcfb_info *sfb = (struct smtcfb_info *)info;
	u32 val;

	if (regno > 255)
		return 1;

	switch (sfb->fb.fix.visual) {
	case FB_VISUAL_DIRECTCOLOR:
	case FB_VISUAL_TRUECOLOR:
		/*
		 * 16/32 bit true-colour, use pseuo-palette for 16 base color
		 */
		if (regno < 16) {
			if (sfb->fb.var.bits_per_pixel == 16) {
				u32 *pal = sfb->fb.pseudo_palette;
				val = chan_to_field(red, &sfb->fb.var.red);
				val |= chan_to_field(green, \
						&sfb->fb.var.green);
				val |= chan_to_field(blue, &sfb->fb.var.blue);
#ifdef __BIG_ENDIAN
				pal[regno] =
				    ((red & 0xf800) >> 8) |
				    ((green & 0xe000) >> 13) |
				    ((green & 0x1c00) << 3) |
				    ((blue & 0xf800) >> 3);
#else
				pal[regno] = val;
#endif
			} else {
				u32 *pal = sfb->fb.pseudo_palette;
				val = chan_to_field(red, &sfb->fb.var.red);
				val |= chan_to_field(green, \
						&sfb->fb.var.green);
				val |= chan_to_field(blue, &sfb->fb.var.blue);
#ifdef __BIG_ENDIAN
				val =
				    (val & 0xff00ff00 >> 8) |
				    (val & 0x00ff00ff << 8);
#endif
				pal[regno] = val;
			}
		}
		break;

	case FB_VISUAL_PSEUDOCOLOR:
		/* color depth 8 bit */
		sm712_setpalette(regno, red, green, blue, info);
		break;

	default:
		return 1;	/* unknown type */
	}

	return 0;

}

#ifdef __BIG_ENDIAN
static ssize_t smtcfb_read(struct fb_info *info, char __user * buf, size_t
				count, loff_t *ppos)
{
	unsigned long p = *ppos;

	u32 *buffer, *dst;
	u32 __iomem *src;
	int c, i, cnt = 0, err = 0;
	unsigned long total_size;

	if (!info || !info->screen_base)
		return -ENODEV;

	if (info->state != FBINFO_STATE_RUNNING)
		return -EPERM;

	total_size = info->screen_size;

	if (total_size == 0)
		total_size = info->fix.smem_len;

	if (p >= total_size)
		return 0;

	if (count >= total_size)
		count = total_size;

	if (count + p > total_size)
		count = total_size - p;

	buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	src = (u32 __iomem *) (info->screen_base + p);

	if (info->fbops->fb_sync)
		info->fbops->fb_sync(info);

	while (count) {
		c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
		dst = buffer;
		for (i = c >> 2; i--;) {
			*dst = fb_readl(src++);
			*dst =
			    (*dst & 0xff00ff00 >> 8) |
			    (*dst & 0x00ff00ff << 8);
			dst++;
		}
		if (c & 3) {
			u8 *dst8 = (u8 *) dst;
			u8 __iomem *src8 = (u8 __iomem *) src;

			for (i = c & 3; i--;) {
				if (i & 1) {
					*dst8++ = fb_readb(++src8);
				} else {
					*dst8++ = fb_readb(--src8);
					src8 += 2;
				}
			}
			src = (u32 __iomem *) src8;
		}

		if (copy_to_user(buf, buffer, c)) {
			err = -EFAULT;
			break;
		}
		*ppos += c;
		buf += c;
		cnt += c;
		count -= c;
	}

	kfree(buffer);

	return (err) ? err : cnt;
}

static ssize_t
smtcfb_write(struct fb_info *info, const char __user *buf, size_t count,
	     loff_t *ppos)
{
	unsigned long p = *ppos;

	u32 *buffer, *src;
	u32 __iomem *dst;
	int c, i, cnt = 0, err = 0;
	unsigned long total_size;

	if (!info || !info->screen_base)
		return -ENODEV;

	if (info->state != FBINFO_STATE_RUNNING)
		return -EPERM;

	total_size = info->screen_size;

	if (total_size == 0)
		total_size = info->fix.smem_len;

	if (p > total_size)
		return -EFBIG;

	if (count > total_size) {
		err = -EFBIG;
		count = total_size;
	}

	if (count + p > total_size) {
		if (!err)
			err = -ENOSPC;

		count = total_size - p;
	}

	buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	dst = (u32 __iomem *) (info->screen_base + p);

	if (info->fbops->fb_sync)
		info->fbops->fb_sync(info);

	while (count) {
		c = (count > PAGE_SIZE) ? PAGE_SIZE : count;
		src = buffer;

		if (copy_from_user(src, buf, c)) {
			err = -EFAULT;
			break;
		}

		for (i = c >> 2; i--;) {
			fb_writel((*src & 0xff00ff00 >> 8) |
				  (*src & 0x00ff00ff << 8), dst++);
			src++;
		}
		if (c & 3) {
			u8 *src8 = (u8 *) src;
			u8 __iomem *dst8 = (u8 __iomem *) dst;

			for (i = c & 3; i--;) {
				if (i & 1) {
					fb_writeb(*src8++, ++dst8);
				} else {
					fb_writeb(*src8++, --dst8);
					dst8 += 2;
				}
			}
			dst = (u32 __iomem *) dst8;
		}

		*ppos += c;
		buf += c;
		cnt += c;
		count -= c;
	}

	kfree(buffer);

	return (cnt) ? cnt : err;
}
#endif	/* ! __BIG_ENDIAN */

static struct fb_ops smtcfb_ops = {
	.owner = THIS_MODULE,
	.fb_setcolreg = smtc_setcolreg,
	.fb_blank = cfb_blank,
	.fb_fillrect = cfb_fillrect,
	.fb_imageblit = cfb_imageblit,
	.fb_copyarea = cfb_copyarea,
#ifdef __BIG_ENDIAN
	.fb_read = smtcfb_read,
	.fb_write = smtcfb_write,
#endif

};

void smtcfb_setmode(struct smtcfb_info *sfb)
{
	switch (sfb->fb.var.bits_per_pixel) {
	case 32:
		sfb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
		sfb->fb.fix.line_length = sfb->fb.var.xres * 4;
		sfb->fb.var.red.length = 8;
		sfb->fb.var.green.length = 8;
		sfb->fb.var.blue.length = 8;
		sfb->fb.var.red.offset = 16;
		sfb->fb.var.green.offset = 8;
		sfb->fb.var.blue.offset = 0;

		break;
	case 8:
		sfb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
		sfb->fb.fix.line_length = sfb->fb.var.xres;
		sfb->fb.var.red.offset = 5;
		sfb->fb.var.red.length = 3;
		sfb->fb.var.green.offset = 2;
		sfb->fb.var.green.length = 3;
		sfb->fb.var.blue.offset = 0;
		sfb->fb.var.blue.length = 2;
		break;
	case 24:
		sfb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
		sfb->fb.fix.line_length = sfb->fb.var.xres * 3;
		sfb->fb.var.red.length = 8;
		sfb->fb.var.green.length = 8;
		sfb->fb.var.blue.length = 8;

		sfb->fb.var.red.offset = 16;
		sfb->fb.var.green.offset = 8;
		sfb->fb.var.blue.offset = 0;

		break;
	case 16:
	default:
		sfb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
		sfb->fb.fix.line_length = sfb->fb.var.xres * 2;

		sfb->fb.var.red.length = 5;
		sfb->fb.var.green.length = 6;
		sfb->fb.var.blue.length = 5;

		sfb->fb.var.red.offset = 11;
		sfb->fb.var.green.offset = 5;
		sfb->fb.var.blue.offset = 0;

		break;
	}

	hw.width = sfb->fb.var.xres;
	hw.height = sfb->fb.var.yres;
	hw.hz = 60;
	smtc_set_timing(sfb, &hw);
}

/*
 * Alloc struct smtcfb_info and assign the default value
 */
static struct smtcfb_info *smtc_alloc_fb_info(struct pci_dev *dev,
							char *name)
{
	struct smtcfb_info *sfb;

	sfb = kzalloc(sizeof(struct smtcfb_info), GFP_KERNEL);

	if (!sfb)
		return NULL;

	sfb->currcon = -1;
	sfb->dev = dev;

	/*** Init sfb->fb with default value ***/
	sfb->fb.flags = FBINFO_FLAG_DEFAULT;
	sfb->fb.fbops = &smtcfb_ops;
	sfb->fb.var = smtcfb_var;
	sfb->fb.fix = smtcfb_fix;

	strcpy(sfb->fb.fix.id, name);

	sfb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
	sfb->fb.fix.type_aux = 0;
	sfb->fb.fix.xpanstep = 0;
	sfb->fb.fix.ypanstep = 0;
	sfb->fb.fix.ywrapstep = 0;
	sfb->fb.fix.accel = FB_ACCEL_SMI_LYNX;

	sfb->fb.var.nonstd = 0;
	sfb->fb.var.activate = FB_ACTIVATE_NOW;
	sfb->fb.var.height = -1;
	sfb->fb.var.width = -1;
	/* text mode acceleration */
	sfb->fb.var.accel_flags = FB_ACCELF_TEXT;
	sfb->fb.var.vmode = FB_VMODE_NONINTERLACED;
	sfb->fb.par = &hw;
	sfb->fb.pseudo_palette = colreg;

	return sfb;
}

/*
 * Unmap in the memory mapped IO registers
 */

static void smtc_unmap_mmio(struct smtcfb_info *sfb)
{
	if (sfb && smtc_RegBaseAddress)
		smtc_RegBaseAddress = NULL;
}

/*
 * Map in the screen memory
 */

static int smtc_map_smem(struct smtcfb_info *sfb,
		struct pci_dev *dev, u_long smem_len)
{
	if (sfb->fb.var.bits_per_pixel == 32) {
#ifdef __BIG_ENDIAN
		sfb->fb.fix.smem_start = pci_resource_start(dev, 0)
			+ 0x800000;
#else
		sfb->fb.fix.smem_start = pci_resource_start(dev, 0);
#endif
	} else {
		sfb->fb.fix.smem_start = pci_resource_start(dev, 0);
	}

	sfb->fb.fix.smem_len = smem_len;

	sfb->fb.screen_base = smtc_VRAMBaseAddress;

	if (!sfb->fb.screen_base) {
		printk(KERN_INFO "%s: unable to map screen memory\n",
				sfb->fb.fix.id);
		return -ENOMEM;
	}

	return 0;
}

/*
 * Unmap in the screen memory
 *
 */
static void smtc_unmap_smem(struct smtcfb_info *sfb)
{
	if (sfb && sfb->fb.screen_base) {
		iounmap(sfb->fb.screen_base);
		sfb->fb.screen_base = NULL;
	}
}

/*
 * We need to wake up the LynxEM+, and make sure its in linear memory mode.
 */
static inline void sm7xx_init_hw(void)
{
	outb_p(0x18, 0x3c4);
	outb_p(0x11, 0x3c5);
}

static void smtc_free_fb_info(struct smtcfb_info *sfb)
{
	if (sfb) {
		fb_alloc_cmap(&sfb->fb.cmap, 0, 0);
		kfree(sfb);
	}
}

/*
 *	sm712vga_setup - process command line options, get vga parameter
 *	@options: string of options
 *	Returns zero.
 *
 */
static int __init __maybe_unused sm712vga_setup(char *options)
{
	int index;

	if (!options || !*options) {
		smdbg("\n No vga parameter\n");
		return -EINVAL;
	}

	smtc_screen_info.lfb_width = 0;
	smtc_screen_info.lfb_height = 0;
	smtc_screen_info.lfb_depth = 0;

	smdbg("\nsm712vga_setup = %s\n", options);

	for (index = 0;
	     index < (sizeof(vesa_mode) / sizeof(struct vesa_mode_table));
	     index++) {
		if (strstr(options, vesa_mode[index].mode_index)) {
			smtc_screen_info.lfb_width = vesa_mode[index].lfb_width;
			smtc_screen_info.lfb_height =
					vesa_mode[index].lfb_height;
			smtc_screen_info.lfb_depth = vesa_mode[index].lfb_depth;
			return 0;
		}
	}

	return -1;
}
__setup("vga=", sm712vga_setup);

/* Jason (08/13/2009)
 * Original init function changed to probe method to be used by pci_drv
 * process used to detect chips replaced with kernel process in pci_drv
 */
static int __devinit smtcfb_pci_probe(struct pci_dev *pdev,
				   const struct pci_device_id *ent)
{
	struct smtcfb_info *sfb;
	u_long smem_size = 0x00800000;	/* default 8MB */
	char name[16];
	int err;
	unsigned long pFramebufferPhysical;

	printk(KERN_INFO
		"Silicon Motion display driver " SMTC_LINUX_FB_VERSION "\n");

	err = pci_enable_device(pdev);	/* enable SMTC chip */
	if (err)
		return err;
	err = -ENOMEM;

	hw.chipID = ent->device;
	sprintf(name, "sm%Xfb", hw.chipID);

	sfb = smtc_alloc_fb_info(pdev, name);

	if (!sfb)
		goto failed_free;
	/* Jason (08/13/2009)
	 * Store fb_info to be further used when suspending and resuming
	 */
	pci_set_drvdata(pdev, sfb);

	sm7xx_init_hw();

	/*get mode parameter from smtc_screen_info */
	if (smtc_screen_info.lfb_width != 0) {
		sfb->fb.var.xres = smtc_screen_info.lfb_width;
		sfb->fb.var.yres = smtc_screen_info.lfb_height;
		sfb->fb.var.bits_per_pixel = smtc_screen_info.lfb_depth;
	} else {
		/* default resolution 1024x600 16bit mode */
		sfb->fb.var.xres = SCREEN_X_RES;
		sfb->fb.var.yres = SCREEN_Y_RES;
		sfb->fb.var.bits_per_pixel = SCREEN_BPP;
	}

#ifdef __BIG_ENDIAN
	if (sfb->fb.var.bits_per_pixel == 24)
		sfb->fb.var.bits_per_pixel = (smtc_screen_info.lfb_depth = 32);
#endif
	/* Map address and memory detection */
	pFramebufferPhysical = pci_resource_start(pdev, 0);
	pci_read_config_byte(pdev, PCI_REVISION_ID, &hw.chipRevID);

	switch (hw.chipID) {
	case 0x710:
	case 0x712:
		sfb->fb.fix.mmio_start = pFramebufferPhysical + 0x00400000;
		sfb->fb.fix.mmio_len = 0x00400000;
		smem_size = SM712_VIDEOMEMORYSIZE;
#ifdef __BIG_ENDIAN
		hw.m_pLFB = (smtc_VRAMBaseAddress =
		    ioremap(pFramebufferPhysical, 0x00c00000));
#else
		hw.m_pLFB = (smtc_VRAMBaseAddress =
		    ioremap(pFramebufferPhysical, 0x00800000));
#endif
		hw.m_pMMIO = (smtc_RegBaseAddress =
		    smtc_VRAMBaseAddress + 0x00700000);
		hw.m_pDPR = smtc_VRAMBaseAddress + 0x00408000;
		hw.m_pVPR = hw.m_pLFB + 0x0040c000;
#ifdef __BIG_ENDIAN
		if (sfb->fb.var.bits_per_pixel == 32) {
			smtc_VRAMBaseAddress += 0x800000;
			hw.m_pLFB += 0x800000;
			printk(KERN_INFO
				"\nsmtc_VRAMBaseAddress=%p hw.m_pLFB=%p\n",
					smtc_VRAMBaseAddress, hw.m_pLFB);
		}
#endif
		if (!smtc_RegBaseAddress) {
			printk(KERN_INFO
				"%s: unable to map memory mapped IO\n",
				sfb->fb.fix.id);
			err = -ENOMEM;
			goto failed_fb;
		}

		/* set MCLK = 14.31818 * (0x16 / 0x2) */
		smtc_seqw(0x6a, 0x16);
		smtc_seqw(0x6b, 0x02);
		smtc_seqw(0x62, 0x3e);
		/* enable PCI burst */
		smtc_seqw(0x17, 0x20);
		/* enable word swap */
#ifdef __BIG_ENDIAN
		if (sfb->fb.var.bits_per_pixel == 32)
			smtc_seqw(0x17, 0x30);
#endif
		break;
	case 0x720:
		sfb->fb.fix.mmio_start = pFramebufferPhysical;
		sfb->fb.fix.mmio_len = 0x00200000;
		smem_size = SM722_VIDEOMEMORYSIZE;
		hw.m_pDPR = ioremap(pFramebufferPhysical, 0x00a00000);
		hw.m_pLFB = (smtc_VRAMBaseAddress =
		    hw.m_pDPR + 0x00200000);
		hw.m_pMMIO = (smtc_RegBaseAddress =
		    hw.m_pDPR + 0x000c0000);
		hw.m_pVPR = hw.m_pDPR + 0x800;

		smtc_seqw(0x62, 0xff);
		smtc_seqw(0x6a, 0x0d);
		smtc_seqw(0x6b, 0x02);
		break;
	default:
		printk(KERN_INFO
		"No valid Silicon Motion display chip was detected!\n");

		goto failed_fb;
	}

	/* can support 32 bpp */
	if (15 == sfb->fb.var.bits_per_pixel)
		sfb->fb.var.bits_per_pixel = 16;

	sfb->fb.var.xres_virtual = sfb->fb.var.xres;
	sfb->fb.var.yres_virtual = sfb->fb.var.yres;
	err = smtc_map_smem(sfb, pdev, smem_size);
	if (err)
		goto failed;

	smtcfb_setmode(sfb);
	/* Primary display starting from 0 postion */
	hw.BaseAddressInVRAM = 0;
	sfb->fb.par = &hw;

	err = register_framebuffer(&sfb->fb);
	if (err < 0)
		goto failed;

	printk(KERN_INFO "Silicon Motion SM%X Rev%X primary display mode"
			"%dx%d-%d Init Complete.\n", hw.chipID, hw.chipRevID,
			sfb->fb.var.xres, sfb->fb.var.yres,
			sfb->fb.var.bits_per_pixel);

	return 0;

 failed:
	printk(KERN_INFO "Silicon Motion, Inc.  primary display init fail\n");

	smtc_unmap_smem(sfb);
	smtc_unmap_mmio(sfb);
failed_fb:
	smtc_free_fb_info(sfb);

failed_free:
	pci_disable_device(pdev);

	return err;
}


/* Jason (08/11/2009) PCI_DRV wrapper essential structs */
static const struct pci_device_id smtcfb_pci_table[] = {
	{0x126f, 0x710, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{0x126f, 0x712, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{0x126f, 0x720, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{0,}
};


/* Jason (08/14/2009)
 * do some clean up when the driver module is removed
 */
static void __devexit smtcfb_pci_remove(struct pci_dev *pdev)
{
	struct smtcfb_info *sfb;

	sfb = pci_get_drvdata(pdev);
	pci_set_drvdata(pdev, NULL);
	smtc_unmap_smem(sfb);
	smtc_unmap_mmio(sfb);
	unregister_framebuffer(&sfb->fb);
	smtc_free_fb_info(sfb);
}

/* Jason (08/14/2009)
 * suspend function, called when the suspend event is triggered
 */
static int __maybe_unused smtcfb_suspend(struct pci_dev *pdev, pm_message_t msg)
{
	struct smtcfb_info *sfb;
	int retv;

	sfb = pci_get_drvdata(pdev);

	/* set the hw in sleep mode use externel clock and self memory refresh
	 * so that we can turn off internal PLLs later on
	 */
	smtc_seqw(0x20, (smtc_seqr(0x20) | 0xc0));
	smtc_seqw(0x69, (smtc_seqr(0x69) & 0xf7));

	switch (msg.event) {
	case PM_EVENT_FREEZE:
	case PM_EVENT_PRETHAW:
		pdev->dev.power.power_state = msg;
		return 0;
	}

	/* when doing suspend, call fb apis and pci apis */
	if (msg.event == PM_EVENT_SUSPEND) {
		acquire_console_sem();
		fb_set_suspend(&sfb->fb, 1);
		release_console_sem();
		retv = pci_save_state(pdev);
		pci_disable_device(pdev);
		retv = pci_choose_state(pdev, msg);
		retv = pci_set_power_state(pdev, retv);
	}

	pdev->dev.power.power_state = msg;

	/* additionaly turn off all function blocks including internal PLLs */
	smtc_seqw(0x21, 0xff);

	return 0;
}

static int __maybe_unused smtcfb_resume(struct pci_dev *pdev)
{
	struct smtcfb_info *sfb;
	int retv;

	sfb = pci_get_drvdata(pdev);

	/* when resuming, restore pci data and fb cursor */
	if (pdev->dev.power.power_state.event != PM_EVENT_FREEZE) {
		retv = pci_set_power_state(pdev, PCI_D0);
		retv = pci_restore_state(pdev);
		if (pci_enable_device(pdev))
			return -1;
		pci_set_master(pdev);
	}

	/* reinit hardware */
	sm7xx_init_hw();
	switch (hw.chipID) {
	case 0x710:
	case 0x712:
		/* set MCLK = 14.31818 *  (0x16 / 0x2) */
		smtc_seqw(0x6a, 0x16);
		smtc_seqw(0x6b, 0x02);
		smtc_seqw(0x62, 0x3e);
		/* enable PCI burst */
		smtc_seqw(0x17, 0x20);
#ifdef __BIG_ENDIAN
		if (sfb->fb.var.bits_per_pixel == 32)
			smtc_seqw(0x17, 0x30);
#endif
		break;
	case 0x720:
		smtc_seqw(0x62, 0xff);
		smtc_seqw(0x6a, 0x0d);
		smtc_seqw(0x6b, 0x02);
		break;
	}

	smtc_seqw(0x34, (smtc_seqr(0x34) | 0xc0));
	smtc_seqw(0x33, ((smtc_seqr(0x33) | 0x08) & 0xfb));

	smtcfb_setmode(sfb);

	acquire_console_sem();
	fb_set_suspend(&sfb->fb, 0);
	release_console_sem();

	return 0;
}

/* Jason (08/13/2009)
 * pci_driver struct used to wrap the original driver
 * so that it can be registered into the kernel and
 * the proper method would be called when suspending and resuming
 */
static struct pci_driver smtcfb_driver = {
	.name = "smtcfb",
	.id_table = smtcfb_pci_table,
	.probe = smtcfb_pci_probe,
	.remove = __devexit_p(smtcfb_pci_remove),
#ifdef CONFIG_PM
	.suspend = smtcfb_suspend,
	.resume = smtcfb_resume,
#endif
};

static int __init smtcfb_init(void)
{
	return pci_register_driver(&smtcfb_driver);
}

static void __exit smtcfb_exit(void)
{
	pci_unregister_driver(&smtcfb_driver);
}

module_init(smtcfb_init);
module_exit(smtcfb_exit);

MODULE_AUTHOR("Siliconmotion ");
MODULE_DESCRIPTION("Framebuffer driver for SMI Graphic Cards");
MODULE_LICENSE("GPL");